Safety-stop for elevators



(No Moclel.)

E. SAUNDERS.

SAFETY STOP FORB LE VATORS.

Patented Mar. 25, 1884.

INVENTOR WITNESSES ATTORNEYS.

N. PETERS, Plmmlithugnpbur. Wuhmglon, D. c.

ELLISON SAUNDERS,

' TENT U OF AUSTIN, TEXAS.

SAFETY-STOP FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 295,678, dated March25, 1884.

Application filed September 10, 1883. (No model.)

Safety-Stop for Elevators, of which the following is a full, clear, andexact description.

The object of my invention is to provide a new and improved attachmentfor elevator-cars to stop the descending car immediately in case theelevating-cable breaks.

The invention consists in a lever pivoted to the bottom of the car, andprovided with a spring for throwing it into position transversely to thecar-bottom, so that the ends of the lever can catch on horizontal barssecured to a the sides of the elevator-shaft. A rope orcable is securedto one end of the lever and to the car-elevating cable, and keeps thespring taut, and prevents it from throwing the lever unless theelevating-cable breaks.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures. l

Figure l is a longitudinal outside elevation of an elevator-shaftcontaining an elevator-car provided with my improved attachment. Fig. 2is a side view of the car. Fig. 3 is a sectional plan View of the shaftand a plan View of the bottom of the car. Fig. 4 is a horizontalsectional view of the elevating-cable,with a part of the safety rope orchain attached.

On two opposite sides of the elevator-shaft a ,series of horizontalbars, B, are securely fastened to the corner-posts G of the shaft,whichbars may be made of wood or metal, and can be spaced from about sixinches to several feet. The bars B can extend entirely across the sidesof the shaft, or can extend to a point slightly beyond the middle of thesides of the shaft, at which point a standard mustbe erected. If

the bars B extend entirely across the sides of the shaft,vertical strutsD are placed between the bars at a point a short distance beyond themiddle of the shaft. A lever, E, is pivoted to the bottom of theelevator-car A, at or near.

the middle of the san1e,which lever is of such length that it can extendfrom the outer sides of the bars B on one side of the shaft to the outersides of the bars B on the opposite side of the shaft, as shown. To oneend of the lever E aspring, F, is fastened, which has its opposite endsecured to the bottom of the car, which spring can draw the lever E insuch a manner that it extends transversely across the bottom of the car,and so that the ends of the said lever project between the bars B. Tothat end of the lever E opposite the one to which the spring F isfastened a cable, rope, or chain, G, is fastenedgvhich runs over pulleysH and H at the bottom and top edges of the car, which cable G isprovided at its upper end with a ring, K, or an eye or pulleyblock,through which the elevator-cable J passes. As long as the cable J istaut, the

cable G is taut and draws the lever E in the inverse direction of thatin which it is drawn by the spring F, thus keeping the entire lever Ewithin the limits of the bottom of the car. If the elevating-cable Jbreaks, the cable G will be slackened, and the spring F can drawthelever E to extend transversely across the bottom of the car, thusthrowing both ends of the lever E between the bars B on the oppositesides of the shaft. The ends of the lever E catch on the bars-andprevent the car from descending. The car is thus prevented fromdropping, and serious accidents can thus be prevented. As the ends ofthe lever E act downward with great force on the bars B at or near themiddle, I have provided the struts D to counteract this pressure andprevent the pressure from breaking the bars B. The bottom of the car isprovided with studs M, to prevent the lever E from swinging too far inone direction or the other. The abovedescribed device operatesinstantaneously, and will never fail to check the car in case theelevetting-cable or the machinery for raising the car breaks.

A cord and weight can be used in place of the spring F.

()ther suitable equivalent devices can be i used in place of the bars B.For instance, grooves can be out in the walls of the elevator shaft, orbrackets can be provided in place of the bars B.

Having thus described my invention,what I claim as new, and desire tosecure by Letters Patent, is

l. The combination,with an elevator-car, of a pivoted lockinglever onits bottom, and of bars or analogous devices on the sides of theelevator-shaft, substantially as herein shown and described.

2. The combination,with an elevator-car, of a lever pivoted to itsbottom, a spring acting on the lever and tending to throw it inatransverse position, and a rope or cable secured to the opposite end ofthe lever, and provided at its upper end with an eye or ring throughwhich the elevating-cablepasses, substantially as herein shown anddescribed.

3. The combination,with an elevator-car, of

" a-lever pivoted to the bottom of the same, a

spring secured to one end of the lever and to the car, a rope secured tothe opposite end of ELLISON SAUNDERS.

Witnesses: Osoiin F. GUNZ, O. SEDGWIOK.

